TY - JOUR
T1 - Theoretical evaluation of the temperature dependence of magnetic anisotropy constants of Nd2Fe14B
T2 - Effects of exchange field and crystal field strength
AU - Sasaki, Ryo
AU - Miura, Daisuke
AU - Sakuma, Akimasa
PY - 2015/4/1
Y1 - 2015/4/1
N2 - To identify the possible mechanism of the coercivity (Hc) degradation of Nd-Fe-B sintered magnets, we study the roles of the exchange field acting on the 4f electrons in Nd ions and theoretically investigate how variation in the exchange field affects the values of the magnetic anisotropy constants K1 and K2. We find that, with decreasing exchange field strength, both values decrease as a result of the lower asphericity of the 4f electron cloud, indicating that the local anisotropy constants might become small around the grain boundaries, where the exchange fields are reduced owing to the smaller coordination number.
AB - To identify the possible mechanism of the coercivity (Hc) degradation of Nd-Fe-B sintered magnets, we study the roles of the exchange field acting on the 4f electrons in Nd ions and theoretically investigate how variation in the exchange field affects the values of the magnetic anisotropy constants K1 and K2. We find that, with decreasing exchange field strength, both values decrease as a result of the lower asphericity of the 4f electron cloud, indicating that the local anisotropy constants might become small around the grain boundaries, where the exchange fields are reduced owing to the smaller coordination number.
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U2 - 10.7567/APEX.8.043004
DO - 10.7567/APEX.8.043004
M3 - Article
AN - SCOPUS:84927946478
VL - 8
JO - Applied Physics Express
JF - Applied Physics Express
SN - 1882-0778
IS - 4
M1 - 043004
ER -